EP0524699B1 - Roulette à pivot non-oscillant - Google Patents

Roulette à pivot non-oscillant Download PDF

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Publication number
EP0524699B1
EP0524699B1 EP92202250A EP92202250A EP0524699B1 EP 0524699 B1 EP0524699 B1 EP 0524699B1 EP 92202250 A EP92202250 A EP 92202250A EP 92202250 A EP92202250 A EP 92202250A EP 0524699 B1 EP0524699 B1 EP 0524699B1
Authority
EP
European Patent Office
Prior art keywords
plate
stud
frame
caster
moment arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92202250A
Other languages
German (de)
English (en)
Other versions
EP0524699A1 (fr
Inventor
James David C/O Eastman Kodak Company Shaw
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ortho Clinical Diagnostics Inc
Original Assignee
Johnson and Johnson Clinical Diagnostics Inc
Clinical Diagnostic Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Johnson and Johnson Clinical Diagnostics Inc, Clinical Diagnostic Systems Inc filed Critical Johnson and Johnson Clinical Diagnostics Inc
Publication of EP0524699A1 publication Critical patent/EP0524699A1/fr
Application granted granted Critical
Publication of EP0524699B1 publication Critical patent/EP0524699B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/04—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors
    • B60B33/045—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors mounted resiliently, by means of dampers

Definitions

  • This invention relates to a caster which, although compliant against horizontal loads, resists oscillations under vertical loading.
  • Casters are known in the art for resiliently carrying heavy loads.
  • the problem is that for a caster to have resiliency, for example, when encountering a horizontal force delivered when the support surface changes abruptly in height, the casters in the past have used energy absorbers which are sensitive to resonances caused by vertical loads.
  • the resiliency of the absorbers applies in the vertical direction as well, so that there are some frequencies under a vertical load which can induce harmonic oscillations. Examples of casters of this construction are described in US-A-2 738 542. These casters are constructed to "give" under a sudden vertical load as well as a sudden horizontal load.
  • Such harmonic oscillations created by vertical loads being "bounced" are unacceptable when the load in question is a fine-tuned instrument. For example, clinical analyzers while transported by truck will not tolerate vertical harmonic oscillations due to bumps in the road.
  • Resistance to vertical loading is provided by conventional casters in frames having a solid vertical connection to the load itself.
  • these are deficient in that they also totally lack resiliency in the horizontal direction, so that horizontal shock is either fully transmitted to the load, or the shock breaks the caster.
  • the problem has been to provide a caster that will resist oscillations caused by any sudden increases in vertical loading, and still provide resiliency against a sudden increase in horizontal force so as to protect the load from damage.
  • a caster is provided which is as free of vertically induced harmonic oscillations as it can be while still providing resiliency under horizontal loading.
  • the invention is described in connection with the preferred embodiments, wherein the caster is used to render transportable a clinical analyzer as the instrument in question.
  • the invention is useful in casters for any heavy instrument which can not tolerate either sudden horizontal jarring or vertical harmonic oscillations, for example, other health instruments or even instruments such as concert pianos.
  • instrument 10 is a heavy clinical analyzer having a variety of stations for dispensing biological liquids on to test elements which feed into an incubator and reading stations for detection, not shown. Any construction of the analyzer can be used, as this invention resides in the casters which allow the instrument to be moved along a horizontal surface. Useful examples are described in EP-A-0 356 250. Such analyzers can weigh as much as 300kg.
  • Instrument 10 has a bottom plate 12 with a housing plate 14 bolted thereto which is preferably hat-shaped.
  • a generally flat load-bearing plate 16 is confined within plate 14 with surface 18 of plate 16 bearing against housing plate 14 over the entire surface 18.
  • Extending from and secured to plate 16 is a stud 20 which threadably engages connecting member 22 which is directly vertically coupled to frame 32 of caster 30 via a bearing 24, thereby ensuring a rigid vertical coupling of frame 32 to load-bearing plate 16.
  • stud 20 is internally threaded at 34 to receive the male threads 36 of member 22.
  • bearing 24 is conventional, comprising for example a race 26 formed in top plate 28 of frame 32, with a double row of balls 29, 29' confined to race 26 by housing flanges 38, 39 welded to connecting member 22.
  • Any conventional locking means can be used to lock member 22 at a particular vertical height relative to stud 20, for example a jam nut 40 ( Figure 1).
  • Frame 32 of caster 30 conventionally is journalled to a roller 42 at journal axis 44.
  • Axis 44 is located at a moment arm m1 from the axis 50 of connection member 22 (also of stud 20).
  • damper 60 is mounted within housing plate 14 so as to surround stud 20, and to bear against plate 18.
  • An exterior plate 62 is used to sandwich damper 60 into this position.
  • the function of damper 60 is to allow connecting member 22, and hence stud 20, to flex out of the vertical by an angle ⁇ , when encountering a horizontal loading force "L".
  • damper 60 is compressed on the side of the loading, as shown, with plate 18 pivoting about its exterior edge surface 64.
  • damper 60 The resiliency of damper 60 is selected on the basis of the horizontal loading expected by instrument 10, as is well-known. For instrument 10 being a clinical analyzer weighing about 300kg, it is preferred that damper 60 have approximately the following resiliency and hardness: 60 - 70 Shore A durometer hardness. Various rubber compounds provide this property.
  • plate 18 is provided with a sufficient horizontal, load-bearing extension, to edge 64, such that edge 64 provides a moment arm m2 (Figure 1) which exceeds moment arm m1.
  • This is a crucial feature, since it minimizes any tendency of moment arm m1 to preload damper 60 to the extent of creating a harmonic response to vertical oscillations of instrument 10.
  • the amount at which m2 is greater than m1 is the amount which ensures that m2/m1 is at least 1.1/1.0.
  • instrument 10A moves on a caster 30A having a frame 32A pivotable via a bearing 24A fixed at a vertical location on a connecting member 22A which threadably engages stud 20A on plate 18A.
  • Stud 20A is surrounded by damper 60A to give resiliency under horizontal loading, all as described before.
  • moment arm m2 of plate 18A exceeds moment arm m1 created by journal axis 44A by its horizontal spacing from axis 50A.
  • stud 20A is externally threaded to receive female threads 36A of connecting member 22A.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handcart (AREA)
  • Body Structure For Vehicles (AREA)

Claims (4)

  1. Agencement formant roulette destiné à monter un instrument lourd (10; 10A) comprenant :
       une roulette (30, 32, 42, 44; 30A, 32A, 44A) ayant un châssis (32; 32A), une roue (42) et des moyens formant tourillon (44, 44A) pour relier la roue (42) au châssis (32; 32A) ;
       des moyens de montage (12, 14) fixés à l'instrument (10; 10A) et auxquels la roulette (30, 32, 42, 44; 30A, 32A, 44A) est fixée ;
       des moyens amortisseurs résilients (60, 62, 64; 60A) placés dans les moyens de montage (12, 14) ; et
       des moyens de connexion (16, 18, 20, 22, 24, 26, 28, 29, 29', 34, 36, 38, 39, 64; 18A, 20A, 22A, 24A, 36A) pour relier de manière pivotante le châssis (32; 32A) de la roulette (30, 32, 42, 44; 30A, 32A, 44A) aux moyens amortisseurs résilients (60, 62; 60A), les moyens de connexion (16, 18, 20, 22, 24, 26, 28, 29, 29', 34, 36, 38, 39, 50, 64; 18A, 20A, 22A, 24A, 36A) comprenant un plateau portant (16, 18, 64; 18A) et un goujon (20, 34; 20A) fixé au plateau (16, 18, 64; 18A) et ayant un axe (50; 50A), le plateau (16, 18, 64; 18A) portant directement sur une de ses surfaces (18; 18A) sur une surface (14) des moyens de montage (12, 14), les moyens amortisseurs (60, 62; 60A) étant disposés pour entourer le goujon (20, 34; 20A) avec le plateau (16, 18, 64; 18A) en appui sur les moyens amortisseurs (60, 62; 60A), le châssis (32; 32A) étant fixé au goujon (20, 34; 20A) afin de fournir des forces verticales directement sur le plateau portant (16, 18, 64; 18A) sans déplacement vertical du châssis (32; 32A) par rapport à l'instrument (10; 10A) ;
       caractérisé en ce que la roue (42) est reliée pour être décentrée du goujon (20, 34; 20A) des moyens de connexion (16, 18, 20, 22, 24, 26, 28, 29, 29', 34, 36, 38, 39, 50, 64; 18A, 20A, 22A, 24A, 36A) et en ce qu'une surface (64) du plateau (16, 18, 64; 18A) s'étend horizontalement pour créer un bras de levier (m₂) depuis l'axe (50; 50A) qui est plus long qu'un bras de levier horizontal quelconque (m₁) créé par les moyens formant tourillon depuis l'axe (50; 50A) de sorte que le goujon (20, 34; 20A) peut être courbé contre les moyens amortisseurs (60, 62; 60A) hors d'un alignement vertical et le plateau (16, 18, 64; 18A) peut déprimer une partie (62) des moyens amortisseurs (60, 62; 60A) lorsque la roue (42) rencontre seulement une force (L) orientée horizontalement.
  2. Agencement selon la revendication 1, dans lequel le goujon (20, 34) est fileté à l'intérieur pour recevoir une tige (22, 36) filetée à l'extérieur reliée de manière pivotante au châssis (32).
  3. Agencement selon la revendication 1, dans lequel le goujon (20A) est fileté à l'extérieur pour recevoir un élément de connexion (22A) fileté à l'intérieur relié de manière pivotante au châssis (32A).
  4. Agencement selon l'une quelconque des revendications 1 à 3, dans lequel le bras de levier le plus long (m₂) du plateau (16, 18, 64; 18A) dépasse un bras de levier horizontal quelconque (m₁) des moyens formant tourillon (44; 44A) de sorte que le rapport du bras de levier le plus long (m₂) et du bras de levier quelconque (m1) est d'au moins 1.1/1.0.
EP92202250A 1991-07-26 1992-07-21 Roulette à pivot non-oscillant Expired - Lifetime EP0524699B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US736367 1991-07-26
US07/736,367 US5109569A (en) 1991-07-26 1991-07-26 Non-oscillating caster

Publications (2)

Publication Number Publication Date
EP0524699A1 EP0524699A1 (fr) 1993-01-27
EP0524699B1 true EP0524699B1 (fr) 1995-08-23

Family

ID=24959612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92202250A Expired - Lifetime EP0524699B1 (fr) 1991-07-26 1992-07-21 Roulette à pivot non-oscillant

Country Status (8)

Country Link
US (1) US5109569A (fr)
EP (1) EP0524699B1 (fr)
JP (1) JPH05193304A (fr)
KR (1) KR930002143A (fr)
CA (1) CA2062645C (fr)
DE (1) DE69204235T2 (fr)
HK (1) HK29196A (fr)
IE (1) IE922424A1 (fr)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994008801A1 (fr) * 1992-10-12 1994-04-28 Feron Investments Limited Chariot a roues et agencement de roues pivotantes associe
WO2000046046A1 (fr) * 1999-02-08 2000-08-10 Kayaba Kogyo Kabushiki Kaisha Roulette
US6944910B2 (en) * 2002-07-03 2005-09-20 Sunrise Medical Hhg Inc. Caster wheel assembly with anti-flutter control
US7284299B2 (en) * 2005-03-08 2007-10-23 Rubbermaid Commercial Products Llp Caster
WO2007016750A1 (fr) * 2005-08-11 2007-02-15 Global Stability & Manoeuvrability Technology Corporation Pty Ltd Ensemble de roue orientable ameliore
WO2010003185A1 (fr) * 2008-07-08 2010-01-14 Rias Technologies (International) Limited Mécanisme de roulette à battement
US9022413B2 (en) 2008-10-08 2015-05-05 Evolution Technologies Inc. Foldable walker apparatus
US8083239B2 (en) 2008-10-08 2011-12-27 Evolution Technologies Inc. Foldable walker apparatus
US8602424B2 (en) 2008-10-08 2013-12-10 Evolution Technologies, Inc. Foldable walker apparatus
US8936256B2 (en) 2008-10-08 2015-01-20 Evolution Technologies Inc. Foldable walker apparatus
DE202010010103U1 (de) * 2010-07-09 2011-11-04 Sudhaus Gmbh & Co. Kg Lenkrolle für Koffer, Gepäckstücke, Transportbehälter o.dgl.
US8505936B2 (en) * 2010-10-29 2013-08-13 Evolution Technologies Inc. Foldable walker apparatus
US9415635B2 (en) 2010-10-29 2016-08-16 Evolution Technologies Inc. Foldable walker apparatus
US8573613B2 (en) 2010-10-29 2013-11-05 Evolution Technologies Inc. Foldable walker apparatus
US9339432B2 (en) 2014-02-28 2016-05-17 Evolution Technologies Inc. Walker apparatus and backrest therefor
US9744094B2 (en) 2014-02-28 2017-08-29 Evolution Technologies Inc. Walker apparatus and backrest therefor
US10730489B2 (en) 2015-09-02 2020-08-04 Evolution Technologies Inc. Brake assembly for height-adjustable patient transport apparatus
US10053062B2 (en) 2015-09-02 2018-08-21 Evolution Technologies Inc. Brake assembly for a height-adjustable walker apparatus
US11648922B2 (en) 2015-09-02 2023-05-16 Evolution Technologies Inc. Manually-operated, height-adjustable wheeled vehicle, and a brake assembly and wheel fork assembly thereof
CA167113S (en) 2016-02-26 2017-12-27 Julian Liu Set of seat cushions
CA173079S (en) 2017-02-17 2017-12-27 Evolution Tech Inc Set of seat cushions
CN108621700B (zh) * 2017-03-20 2023-11-28 通用电气公司 医疗设备
US11712924B2 (en) * 2019-11-13 2023-08-01 Superior Tire and Rubber Corp. Caster assembly
SE2550231A1 (en) * 2025-03-12 2025-10-29 Husqvarna Ab Caster Wheel Assembly for a Robotic Lawnmower, and Robotic Lawnmower comprising a Caster Wheel Assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442831A (en) * 1946-10-04 1948-06-08 Suttles Omar Caster suspending and cushioning device
US2738542A (en) * 1952-04-21 1956-03-20 Harry I Clark Shock absorbing caster
GB785295A (en) * 1954-02-08 1957-10-23 Emmanuel Kaye Improvements in or relating to castor wheels
US3286298A (en) * 1964-12-08 1966-11-22 William J Veary Caster assembly
US4000912A (en) * 1975-02-21 1977-01-04 Mse Corporation Shock absorber
FR2399328A1 (fr) * 1977-08-02 1979-03-02 Hervieu Roulettes a suspension
EP0075910A1 (fr) * 1981-09-28 1983-04-06 Deere & Company Disposition de roue mobile, notamment pour petits véhicules

Also Published As

Publication number Publication date
IE922424A1 (en) 1993-01-27
US5109569A (en) 1992-05-05
JPH05193304A (ja) 1993-08-03
CA2062645C (fr) 1994-12-13
DE69204235T2 (de) 1996-03-21
DE69204235D1 (de) 1995-09-28
HK29196A (en) 1996-02-23
KR930002143A (ko) 1993-02-22
EP0524699A1 (fr) 1993-01-27

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